Laptop suddenly shuts down, on rebooting says “checksum error-502”

[Suhaib_Abdullah]

So for almost a week my laptop has suddenly started to shutdown when using it whilst the battery is charged(even uptp 90%)

When I press the power button to reboot, Then white light on the side turns on and then suddenly turns off, So I have to connect the adapter and then switch on the laptop, 

Upon switching on it immediately says “CMOS Reset-502”

”CMOS checksum is invalid”

” The CMOS will be reset to the default configuration 

 and will be rebooted, Please check your BIOS Setup option to see if they change”

I Even updated to the latest BIOS, and my laptop battery and adaptor are both new(recently replaced)

Does this mean that the CMOS Battery is damaged and hence I have to buy a new CMOS Battery

IF YES, then can I just buy the CMOS with the right serial number from online and just replace it

Would appreciate if any one of you could solve my problem

[Sneha_01]

Hi @Suhaib_Abdullah,

Welcome to the HP Support Community

I understand you are facing an issue with your HP Notebook. Not to worry I will help you to get a resolution to resolve the issue.

To assist better:

• May I have the exact model name of the product? Refer to this document for steps to find the product details. Do not share any of your personal information such as serial, phone number, email ID, etc.
• Does your laptop shut down when connected to an adapter?
• Do you get any message that the battery is low when your laptop shuts down?
• If your laptop does not shut down when it is connected to an adapter. It could be an issue with the battery.
• As the battery is a consumable part the life of the battery decreases each time you charge your laptop.
• Was there any update on the PC prior to the issue?
• Did you install any new software or hardware prior to the issue?
• Are you using a standard AC Adapter that came with the unit?

While you respond to that, let's try out the below steps:

Update the BIOS,  & Chipset drivers:

• Here's the link to download and install the above updates: Click here

Perform Windows Update and HP Support Assistant: (do not skip any troubleshooting steps if you feel steps are repeating) 

To check for updates now, select the Start button, and then go to Settings  > Update & security  > Windows Update, and select Check for updates.

Install updates from HP Support Assistant: Go to Download HP Support Assistant to install the tool.

1. To open HP Support Assistant, double-click the HP Support Assistant icon 
2. Click My devices in the top menu, and then click Updates in the My PC.
3. Click Check for updates and messages to scan for new updates.
4. Review the list of updates. Updates with a yellow information icon are recommended. Updates with a blue information icon are optional.
5. Click the update name for a description, version number, and file size.
6. Select the box next to any updates you want to install, and then click Download and install.

• Open Power Options on Windows 10.
  Click Change plan settings for any of the power plans. I would suggest you choose the power saver plan.
• Now click Change advanced power settings.
• Under the Advanced Settings tab, scroll down to find Processor power management.
• Now, expand (click on +) Processor power management.
• Expand Maximum processor state.
• Click the On-battery option and reduce the processor state to 20%. You can choose any other value.
• Click Ok. The settings are saved, you can close the Power Options window.
• Enable Adaptive Brightness
• Go to Power Options select change advanced power settings
• Go to the Change advanced power settings. Expand Display> expand Enable Adaptive Brightness. Now, turn on Adaptive Brightness for On-battery and Plugged in options (whichever you like. Click Ok to save the settings.

If the issue still persists try uninstalling the battery drivers device manager.

• Search for and open Device Manager.
  Click next to Batteries to expand the battery options.
  With the options expanded, right-click each ACPI option and in the menu, click Uninstall.
  Restart the computer.
  The battery should now charge properly.

Refer to this article to know how to run a battery test and perform a battery calibration on your laptop.

If the issue persists, then please follow the steps mentioned in this document: HP PCs - Testing for hardware failures in Windows 10

Hope this helps! Keep me posted. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[Suhaib_Abdullah]

•HP Notebook - 15-dw0004ne
•Laptop doesn’t shutdown when connected to an adapter

•No new updates were installed recently before the problems started

•Using the exact adapter that was provided for the laptop

-I removed the battery and noticed that the battery has swollen on 1 side( One of the 3cells of the battery is swollen), could this be the reason behind the checksum error-502 and sudden shutdowns? 

-I just purchased this HP Battery model no-HT03XL from HP World 4 months ago as my previous battery lost its capacity after using for a couple of years, now this new battery has swollen up and can’t be used, is it possible to get a new one of these batteries as they do have a 1 year warranty?